CN216120310U - Busbar and photovoltaic module - Google Patents

Abstract

The utility model discloses a bus bar and a photovoltaic module, and relates to the technical field of photovoltaic modules. The bus bar can improve the ratio of the effective utilization area of the photovoltaic module. The bus bar is provided with a first side face, a second side face, a third side face and a fourth side face, the first side face and the second side face are distributed oppositely in the width direction of the bus bar, the third side face and the fourth side face are distributed oppositely in the thickness direction of the bus bar, and the first side face is used for corresponding to a frame of the photovoltaic module; the first side face, the third side face and the fourth side face are all coated with insulating layers, the third side face is provided with a groove, the second side face is provided with an opening communicated with the groove, and the opening is used for guiding the interconnection strip to extend into the groove.

Description

Busbar and photovoltaic module

Technical Field

The utility model relates to the technical field of photovoltaic modules, in particular to a bus bar and a photovoltaic module.

Background

A photovoltaic module is a device for realizing photoelectric conversion, and generally includes a cell sheet, an interconnection bar, a bus bar, and the like. The plurality of battery pieces are connected in series by the interconnection bars, and then the plurality of interconnection bars are connected by the bus bars, so that the plurality of battery strings are connected, and current of the plurality of battery strings is led out.

The surface of the bus bar in the prior art is a conductive tin-lead alloy layer, the frame of the photovoltaic module is also a conductive aluminum structure, the frame cannot be electrified, potential difference exists between the bus bar and the frame, if the creepage distance between the frame and the bus bar is insufficient, breakdown can be caused, the current on the bus bar flows to the frame to enable the frame to be electrified, the safety problem in the maintenance process of a power station end is brought, and the photovoltaic module cannot generate electricity and then fails.

And the demand to high power photovoltaic module is more and more in the market, for satisfying the electrically conductive demand of heavy current, the interval between area and the subassembly frame that converges needs the increase to increase creepage distance avoids foretell breakdown problem. But this results in a reduced proportion of the available utilization area of the photovoltaic module.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a bus bar and a photovoltaic module, wherein the bus bar can improve the effective utilization area ratio of the photovoltaic module.

In a first aspect, the present invention provides a bus bar, the bus bar having a first side, a second side, a third side and a fourth side, the first side and the second side being distributed oppositely in a width direction of the bus bar, the third side and the fourth side being distributed oppositely in a thickness direction of the bus bar, the first side being configured to correspond to a frame of a photovoltaic module; the first side face, the third side face and the fourth side face are all coated with insulating layers, the third side face is provided with a groove, the second side face is provided with an opening communicated with the groove, and the opening is used for guiding the interconnection strip to extend into the groove.

Through above-mentioned technical scheme, the recess is seted up on the third side that has the coating insulating layer, can make the interconnection bar pass the opening and stretch into in the recess to can realize the welding of interconnection bar and busbar. Since the first side surface, the third side surface and the fourth side surface are coated with the insulating layers, a creepage distance D between the first bus bar and the frame should be a distance between the first side surface and the frame shown in the drawing added to a distance between the first side surface and the groove. As can be seen from the schematic diagram of the bus bar and the frame in the prior art, the creepage distance between the bus bar and the frame in the prior art is only the distance between the first side surface and the frame. Therefore, the bus bar provided by the utility model can increase the creepage distance without increasing the distance between the first side surface and the frame. Therefore, the bus bar provided by the utility model can improve the ratio of the effective utilization area of the photovoltaic module.

In one possible embodiment, the second side can also be coated with an insulating layer. Under the condition of adopting the technical scheme, the insulating capacity between the second side surface of the bus bar and the adjacent battery piece can be improved, and the current in the battery string can be ensured to flow according to a designed route.

In one possible embodiment, the insulating layer may be one or a combination of any more of a phenolic resin, a polyamideimide, a polyimide, a polymaleimide, and a polydiphenyl ether.

In one example, the thickness of the insulating layer may be 0.002mm-0.1 mm.

In one possible implementation, the inner walls of the groove may be coated with a layer of flux. Under the condition of adopting this technical scheme, can utilize welding tool to make the solder flux layer melt, and then will interconnect the strip welding in the recess. The solder layer may be a tin-lead alloy layer.

In one possible embodiment, the groove may be a semicircular groove, an arc groove, a triangular groove, or a square groove. Under the condition of adopting this technical scheme, can select for use the busbar that has corresponding recess according to the shape of interconnection bar, make the shape looks adaptation of recess and interconnection bar, do benefit to the interconnection bar like this and place steadily in the recess to do benefit to when the welding, keep the relative position between interconnection bar and the busbar stable.

In a possible implementation manner, the bus bar further includes a light reflecting structure located on a side where the fourth side is located, the light reflecting structure has a light reflecting surface, an insulating layer is disposed in the light reflecting structure, and the light reflecting surface covers a surface of the insulating layer. Under the condition of adopting this technical scheme, on the one hand, when the busbar was applied to photovoltaic module in, the busbar was located the battery piece clearance, and reflecting structure can be with shining the light reflection to the battery piece of clearance department on, is favorable to the promotion of photovoltaic module power like this. On the other hand, the insulating layer is positioned on the light reflecting structure, so that the light reflecting structure can simultaneously realize the functions of light reflection and insulation.

In one example, the light reflecting structure includes at least one bar-shaped protrusion extending in a length direction of the bus bar, the bar-shaped protrusion having a first light reflecting surface and a second light reflecting surface distributed in a width direction of the bus bar. Under the condition of adopting the technical scheme, the first reflecting surface can reflect the light to the battery piece adjacent to the first reflecting surface, and the second reflecting surface can reflect the light to the battery piece adjacent to the second reflecting surface.

In one example, the number of the bar-shaped projections may be plural, and the plural bar-shaped projections are spaced apart in the width direction of the bus bar. Under the condition of adopting this technical scheme, can utilize a plurality of bar archs to reflect light, can improve light reflection efficiency, make more light reflected to the battery piece on.

In a second aspect, the present invention provides a photovoltaic module comprising a busbar according to any one or any combination of the above. Therefore, the photovoltaic module has the same technical effects as the bus bar.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic diagram of a creepage distance between a bus bar and a frame in the prior art, the bus bar being a cross-sectional view;

fig. 2 is a schematic diagram illustrating a creepage distance between a bus bar and a frame according to an embodiment of the present invention, where the bus bar is a cross-sectional view;

fig. 3 is a schematic view of a creepage distance between a bus bar and a frame according to another embodiment of the present invention, where the bus bar is a schematic cross-sectional view;

fig. 4 is a longitudinal sectional view of the bus bar provided in fig. 2, based on the right view of fig. 2.

Reference numerals:

1-a frame;

21-substrate, 22-solder layer, 23-insulating layer, 24-groove;

31-first side, 32-second side, 33-third side, 34-fourth side.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Demand to high power photovoltaic module is more and more in the market, for satisfying the electrically conductive demand of heavy current, converges the interval between area and the subassembly frame and need increase to increase creepage distance avoids puncturing. But this results in a reduced proportion of the available utilization area of the photovoltaic module. Here, according to GB/T37410-2019, creepage distance refers to the shortest distance of the insulating material surface between two conductive parts.

In order to solve the problem of the reduction of the ratio of the effective utilization area of the high-power photovoltaic module, referring to fig. 2, the bus bar of the present invention has a first side surface 31, a second side surface 32, a third side surface 33 and a fourth side surface 34, wherein the first side surface 31 and the second side surface 32 are distributed oppositely in the width direction of the bus bar, the third side surface 33 and the fourth side surface 34 are distributed oppositely in the thickness direction of the bus bar, and the first side surface 31 is used for corresponding to the frame 1 of the photovoltaic module; the first side 31, the third side 33 and the fourth side 34 are coated with an insulating layer 23, the third side 33 is provided with a groove 24, and the second side 32 is provided with an opening communicating with the groove 24, the opening being used for guiding the interconnection bar to extend into the groove 24.

Through above-mentioned technical scheme, recess 24 is seted up on the third side 33 that coats and is coated with insulating layer 23, can make the interconnection bar pass the opening and stretch into in recess 24 to can realize the welding of interconnection bar and busbar. Since the first side surface 31, the third side surface 33, and the fourth side surface 34 are all coated with the insulating layer 23, a creepage distance D between the first bus bar and the bezel 1 should be a distance between the first side surface 31 and the bezel 1 shown in fig. 2 added to a distance between the first side surface 31 and the groove 24. As can be seen from the schematic view of the bus bar and the frame 1 in the prior art shown in fig. 1, the creepage distance between the bus bar and the frame 1 in the prior art can only be the distance between the first side surface 31 and the frame 1. Therefore, the bus bar provided by the utility model can increase the creepage distance without increasing the distance between the first side surface 31 and the frame 1. Therefore, the bus bar provided by the utility model can improve the ratio of the effective utilization area of the photovoltaic module.

In a possible implementation, as shown with reference to fig. 3, the second side 32 may also be coated with an insulating layer 23. With the adoption of the technical scheme, the insulating capacity between the second side surface 32 of the bus bar and the adjacent battery piece can be improved, and the current in the battery string can be ensured to flow according to a designed route.

In one possible embodiment, the insulating layer 23 may be one or a combination of any more of a phenolic resin, a polyamideimide, a polyimide, a polymaleimide, and a polydiphenyl ether. The insulating layer 23 may be applied using a spraying or printing process. The insulating layers 23 on different sides of a bus bar may be the same or different. The present invention is not limited to the above.

The thickness of the insulating layer 23 may be in direct proportion to the power level of the photovoltaic module. If the bus bar is to be used for a photovoltaic module with a large power, the thickness of the insulating layer 23 can be made larger to enhance the insulating ability and prevent the bus bar from being broken down; if the bus bar is to be used for a photovoltaic module having a small power, the thickness of the insulating layer 23 can be made appropriately small. In one example, the thickness of the insulating layer 23 may be 0.002mm-0.1 mm. The thickness of the insulating layer 23 on different sides of one bus bar may be the same or different. The present invention is not limited thereto.

In one possible implementation, as shown with reference to fig. 2-4, the inner walls of the groove 24 may be coated with a layer of flux 22. With this solution, the welding tool can be used to melt the flux layer 22 and thus weld the interconnection bar in the groove 24. The flux layer 22 may be a tin-lead alloy layer.

In addition, the bus bar may include a base 21, a flux layer 22, and an insulating layer 23, and the base 21 may be coated with the flux layer 22 on a side where the third side 33 is located and a side where the fourth side 34 is located, respectively, and the insulating layer 23 is coated on the flux layer 22 on both sides. While on the side of the first side 31 and on the side of the second side 32 an insulating layer 23 may be applied on the substrate 21. The substrate 21 may be metallic copper. Thus, in another example, the inner wall of the groove 24 may also be the bare substrate 21, and the interconnection bar may be soldered in the groove 24 by injecting molten solder into the groove 24.

In one possible embodiment, the groove 24 may be a semicircular groove 24, an arc-shaped groove 24, a triangular groove 24, or a square groove 24. Under the condition of adopting this technical scheme, can select for use the busbar that has corresponding recess 24 according to the shape of interconnection bar, make recess 24 and interconnection bar's shape looks adaptation, do benefit to the interconnection bar like this and place steadily in recess 24 to do benefit to when the welding, keep the relative position between interconnection bar and the busbar stable. For example, when the interconnecting strips are semi-circular, the grooves 24 are semi-circular grooves 24; when the interconnecting strips are triangular, the grooves 24 are triangular grooves 24.

In one example, the depth of the groove 24 may be slightly greater than or equal to the thickness of the interconnecting strips. Under the condition of adopting this technical scheme, can avoid interconnection strip protrusion in third side 33, and then reduce the hidden risk of splitting of battery piece. In addition, when the interconnection bar is welded in the groove 24 by injecting the molten solder, if the side of the interconnection bar facing away from the groove 24 is lower than the third side surface 33, the molten solder can be made to submerge the interconnection bar, thereby enhancing the welding firmness between the interconnection bar and the groove 24. For example, the depth of the groove 24 may be 0.01-0.5 mm.

The width direction of the groove 24 coincides with the length direction of the bus bar, and in one embodiment, the groove 24 and the interconnection bar may be clearance-fitted in the width direction of the groove 24. Under the condition of adopting this technical scheme, can conveniently stretch into recess 24 with the interconnection strip, and the clearance between recess 24 and the interconnection strip can hold above-mentioned molten solder that pours into. The width of the groove 24 is set according to the width of the corresponding interconnection bar, and may be, for example, 0.02 to 2 mm.

In addition, the number of grooves on one bus bar may be the same as the number of interconnection bars to be connected, and a plurality of grooves are distributed at intervals in the length direction of the bus bar, and the distribution interval is determined according to the interval between corresponding interconnection bars, so that the interconnection bars can be inserted into the grooves in a one-to-one correspondence. In one example, the spacing between the grooves may be 2-30 mm.

In one example, the width dimension of the groove 24 may be constant in the direction of the opening toward the corresponding groove bottom.

In another example, the grooves 24 may be trapezoidal grooves 24, i.e., the width dimension of the grooves 24 gradually increases in a direction that opens toward the respective groove bottom. With this technical solution, when the molten solder is poured into the groove 24, the risk of the molten solder overflowing from the opening can be reduced.

In addition, the length direction of the groove 24 coincides with the width direction of the bus bar, and the length dimension of the groove 24 is smaller than the width dimension of the bus bar. Wherein the width of the bus bar may be 3-10 mm.

In a possible implementation manner, the bus bar further includes a light reflecting structure located on the side of the fourth side 34, the light reflecting structure has a light reflecting surface, the insulating layer 23 is disposed in the light reflecting structure, and the light reflecting surface covers the surface of the insulating layer 23. Under the condition of adopting this technical scheme, on the one hand, when the busbar was applied to photovoltaic module in, the busbar was located the battery piece clearance, and reflecting structure can be with shining the light reflection to the battery piece of clearance department on, is favorable to the promotion of photovoltaic module power like this. On the other hand, the insulating layer 23 is located on the light reflecting structure so that the light reflecting structure can perform both the light reflecting and insulating functions.

In one example, the light reflecting structure includes at least one bar-shaped protrusion extending in a length direction of the bus bar, the bar-shaped protrusion having a first light reflecting surface and a second light reflecting surface distributed in a width direction of the bus bar. Under the condition of adopting the technical scheme, the first reflecting surface can reflect the light to the battery piece adjacent to the first reflecting surface, and the second reflecting surface can reflect the light to the battery piece adjacent to the second reflecting surface. The strip-shaped bulges can be in a triangular cone shape or an arc shape. Wherein, the stripe-shaped projection may be formed on the substrate 21, and then the insulating layer 23 and the light reflecting surface are sequentially coated on the stripe-shaped projection. The insulating layer 23 on the strip-shaped protrusions is connected with the insulating layer 23 on the other part of the base body 21 without a gap.

In one example, the number of the bar-shaped projections may be plural, and the plural bar-shaped projections are spaced apart in the width direction of the bus bar. Under the condition of adopting this technical scheme, can utilize a plurality of bar archs to reflect light, can improve light reflection efficiency, make more light reflected to the battery piece on.

In a second aspect, the present invention provides a photovoltaic module comprising a busbar according to any one or any combination of the above. Therefore, the photovoltaic module has the same technical effects as the bus bar.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (10)

1. A bus bar, wherein the bus bar has a first side, a second side, a third side and a fourth side, the first side and the second side are distributed oppositely in a width direction of the bus bar, the third side and the fourth side are distributed oppositely in a thickness direction of the bus bar, and the first side is used for corresponding to a frame of a photovoltaic module; the first side face, the third side face and the fourth side face are all coated with insulating layers, the third side face is provided with a groove, the second side face is provided with an opening communicated with the groove, and the opening is used for guiding the interconnection strip to extend into the groove.

2. The bus bar of claim 1, wherein the second side is coated with the insulating layer.

3. The bus bar of claim 1, wherein the insulating layer is a combination of one or any more of phenolic resin, polyamideimide, polyimide, polymaleimide, and polydiphenylether.

4. The bus bar of claim 1, wherein the insulating layer has a thickness of 0.002mm to 0.1 mm.

5. The bus bar of claim 1, wherein an inner wall of the groove is coated with a flux layer.

6. The bus bar of claim 1, wherein the groove is a semicircular groove, an arc-shaped groove, a triangular groove, or a square groove.

7. The bus bar according to any one of claims 1 to 6, further comprising a light reflecting structure on a side of the fourth side, the light reflecting structure having a light reflecting surface, the insulating layer being disposed within the light reflecting structure, the light reflecting surface overlying a surface of the insulating layer.

8. The bus bar according to claim 7, wherein the light reflecting structure comprises at least one bar-shaped protrusion extending in a length direction of the bus bar, the bar-shaped protrusion having a first light reflecting surface and a second light reflecting surface distributed in a width direction of the bus bar.

9. The bus bar according to claim 8, wherein the number of the bar-shaped projections is plural, and the plural bar-shaped projections are distributed at intervals in a width direction of the bus bar.

10. A photovoltaic module comprising a busbar according to any one of claims 1 to 9.

Images